/**
 * JS中模拟Map操作
 * 
 * @author zhoubang 2015-4-1 18：00
 */
Array.prototype.remove = function(s) {
    for (var i = 0; i < this.length; i++) {
        if (s == this[i]) {
            this.splice(i, 1);
        }
    }
}

function Map() {
    /** 存放键的数组(遍历用到) */
    this.keys = new Array();
    /** 存放数据 */
    this.data = new Object();

    /**
     * 放入一个键值对
     * 
     * @param {String}
     *            key
     * @param {Object}
     *            value
     */
    this.put = function(key, value) {
        if (this.data[key] == null) {
            this.keys.push(key);
        }
        this.data[key] = value;
    };

    /**
     * 获取某键对应的值
     * 
     * @param {String}
     *            key
     * @return {Object} value
     */
    this.get = function(key) {
        return this.data[key];
    };

    /**
     * 删除一个键值对
     * 
     * @param {String}
     *            key
     */
    this.remove = function(key) {
        this.keys.remove(key);
        this.data[key] = null;
    };

    /**
     * 遍历Map,执行处理函数
     * 
     * @param {Function}
     *            回调函数 function(key,value,index){..}
     */
    this.each = function(fn) {
        if (typeof fn != 'function') {
            return;
        }
        var len = this.keys.length;
        for (var i = 0; i < len; i++) {
            var k = this.keys[i];
            fn(k, this.data[k], i);
        }
    };

    /**
     * 获取键值数组(类似Java的entrySet())
     * 
     * @return 键值对象{key,value}的数组
     */
    this.entrys = function() {
        var len = this.keys.length;
        var entrys = new Array(len);
        for (var i = 0; i < len; i++) {
            entrys[i] = {
                key : this.keys[i],
                value : this.data[i]
            };
        }
        return entrys;
    };

    /**
     * 判断Map是否为空
     */
    this.isEmpty = function() {
        return this.keys.length == 0;
    };

    /**
     * 获取键值对数量
     */
    this.size = function() {
        return this.keys.length;
    };

    /**
     * 重写toString
     */
    this.toString = function() {
        var s = "{";
        for (var i = 0; i < this.keys.length; i++, s += ',') {
            var k = this.keys[i];
            s += k + "=" + this.data[k];
        }
        s += "}";
        return s;
    };
}

/**
 * Map使用测试
 */
/*
 * function testMap() { var m = new Map(); m.put('key1', 'Comtop');
 * m.put('key2', '南方电网'); m.put('key3', '景新花园'); alert("init:" + m);
 * 
 * m.put('key1', '康拓普'); alert("set key1:" + m);
 * 
 * m.remove("key2"); alert("remove key2: " + m);
 * 
 * var s = ""; m.each(function(key, value, index) { s += index + ":" + key + "=" +
 * value + "/n"; }); alert(s); }
 */